chore: add missing dependencies in playground

[boazpoolman]

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Why is it needed?

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b51c2e9) 100.00% compared to head (c77d298) 100.00%.
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff            @@
##            master      #117   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines           27        27           
  Branches         3         3           
=========================================
  Hits            27        27           

Flag	Coverage Δ
unit	100.00% <ø> (ø)

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